diff --git a/scripts/src/bus.lua b/scripts/src/bus.lua
index 106967eb2cb42..ee74ad077ac9a 100644
--- a/scripts/src/bus.lua
+++ b/scripts/src/bus.lua
@@ -5773,6 +5773,8 @@ if (BUSES["H89BUS"]~=null) then
 		MAME_DIR .. "src/devices/bus/heathzenith/h89/sigmasoft_parallel_port.h",
 		MAME_DIR .. "src/devices/bus/heathzenith/h89/we_pullup.cpp",
 		MAME_DIR .. "src/devices/bus/heathzenith/h89/we_pullup.h",
+		MAME_DIR .. "src/devices/bus/heathzenith/h89/z_89_11.cpp",
+		MAME_DIR .. "src/devices/bus/heathzenith/h89/z_89_11.h",
 		MAME_DIR .. "src/devices/bus/heathzenith/h89/z37_fdc.cpp",
 		MAME_DIR .. "src/devices/bus/heathzenith/h89/z37_fdc.h",
 	}
diff --git a/src/devices/bus/heathzenith/h89/cards.cpp b/src/devices/bus/heathzenith/h89/cards.cpp
index 0f22c6401f883..888a6b275d9e5 100644
--- a/src/devices/bus/heathzenith/h89/cards.cpp
+++ b/src/devices/bus/heathzenith/h89/cards.cpp
@@ -16,6 +16,7 @@
 #include "sigmasoft_parallel_port.h"
 #include "sigmasoft_sound.h"
 #include "we_pullup.h"
+#include "z_89_11.h"
 #include "z37_fdc.h"
 
 void h89_left_cards(device_slot_interface &device)
@@ -30,6 +31,8 @@ void h89_right_cards(device_slot_interface &device)
 	device.option_add("ha_88_3", H89BUS_HA_88_3);
 	device.option_add("h_88_5", H89BUS_H_88_5);
 	device.option_add("ss_snd", H89BUS_SIGMASOFT_SND);
+	device.option_add("z_89_11", H89BUS_Z_89_11);
+
 	device.option_add("z37fdc", H89BUS_Z37);
 }
 
diff --git a/src/devices/bus/heathzenith/h89/z_89_11.cpp b/src/devices/bus/heathzenith/h89/z_89_11.cpp
new file mode 100644
index 0000000000000..cc2dd7a1972fe
--- /dev/null
+++ b/src/devices/bus/heathzenith/h89/z_89_11.cpp
@@ -0,0 +1,330 @@
+// license:BSD-3-Clause
+// copyright-holders:Mark Garlanger
+/***************************************************************************
+
+  Heath/Zenith Z-89-11    Multi-Mode Interface Card
+
+****************************************************************************/
+
+#include "emu.h"
+
+#include "z_89_11.h"
+
+#include "bus/rs232/rs232.h"
+#include "machine/i8255.h"
+#include "machine/ins8250.h"
+#include "machine/scn_pci.h"
+
+namespace {
+
+class z_89_11_device : public device_t, public device_h89bus_right_card_interface
+{
+public:
+
+	z_89_11_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = XTAL(1'843'200).value());
+
+	virtual void write(u8 select_lines, u8 offset, u8 data) override;
+	virtual u8 read(u8 select_lines, u8 offset) override;
+
+protected:
+
+	virtual void device_start() override ATTR_COLD;
+	virtual void device_reset() override ATTR_COLD;
+	virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+	virtual ioport_constructor device_input_ports() const override ATTR_COLD;
+
+	void lp_w(offs_t reg, u8 val);
+	u8 lp_r(offs_t reg);
+
+	void aux_w(offs_t reg, u8 val);
+	u8 aux_r(offs_t reg);
+
+	void modem_w(offs_t reg, u8 val);
+	u8 modem_r(offs_t reg);
+
+	void update_intr(u8 level);
+
+	void aux_int(int data);
+
+	required_device<i8255_device>    m_lp;
+	required_device<ins8250_device>  m_aux;
+	required_device<scn2661c_device> m_modem;
+	required_ioport                  m_cfg_lp;
+	required_ioport                  m_cfg_aux;
+	required_ioport                  m_cfg_modem;
+
+
+	bool m_lp_enabled;
+	bool m_aux_enabled;
+	bool m_modem_enabled;
+
+	u8 m_lp_int_idx;
+	u8 m_aux_int_idx;
+	u8 m_modem_int_idx;
+
+	int m_lp_intr;
+	int m_aux_intr;
+	int m_modem_intr;
+
+};
+
+
+z_89_11_device::z_89_11_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock):
+	device_t(mconfig, H89BUS_Z_89_11, tag, owner, clock),
+	device_h89bus_right_card_interface(mconfig, *this),
+	m_lp(*this, "lp"),
+	m_aux(*this, "aux"),
+	m_modem(*this, "modem"),
+	m_cfg_lp(*this, "CFG_LP"),
+	m_cfg_aux(*this, "CFG_AUX"),
+	m_cfg_modem(*this, "CFG_MODEM"),
+	m_lp_intr(0),
+	m_aux_intr(0),
+	m_modem_intr(0)
+{
+}
+
+u8 z_89_11_device::read(u8 select_lines, u8 offset)
+{
+	if ((select_lines & h89bus_device::H89_SER0) && (m_aux_enabled))
+	{
+		return aux_r(offset);
+	}
+
+	if ((select_lines & h89bus_device::H89_SER1) && (m_modem_enabled))
+	{
+		return modem_r(offset);
+	}
+
+	if ((select_lines & h89bus_device::H89_LP) && (m_lp_enabled))
+	{
+		return lp_r(offset);
+	}
+
+	return 0;
+}
+
+void z_89_11_device::write(u8 select_lines, u8 offset, u8 data)
+{
+	if ((select_lines & h89bus_device::H89_SER0) && (m_aux_enabled))
+	{
+		aux_w(offset, data);
+		return;
+	}
+
+	if ((select_lines & h89bus_device::H89_SER1) && (m_modem_enabled))
+	{
+		modem_w(offset, data);
+		return;
+	}
+
+	if ((select_lines & h89bus_device::H89_LP) && (m_lp_enabled))
+	{
+		lp_w(offset, data);
+		return;
+	}
+}
+
+u8 z_89_11_device::lp_r(offs_t reg)
+{
+	return m_lp->read(reg);
+}
+
+void z_89_11_device::lp_w(offs_t reg, u8 val)
+{
+	m_lp->write(reg, val);
+}
+
+u8 z_89_11_device::aux_r(offs_t reg)
+{
+	return m_aux->ins8250_r(reg);
+}
+
+void z_89_11_device::aux_w(offs_t reg, u8 val)
+{
+	m_aux->ins8250_w(reg, val);
+}
+
+u8 z_89_11_device::modem_r(offs_t reg)
+{
+	return m_modem->read(reg);
+}
+
+void z_89_11_device::modem_w(offs_t reg, u8 val)
+{
+	m_modem->write(reg, val);
+}
+
+void z_89_11_device::update_intr(u8 level)
+{
+	// check for interrupt disabled
+	if (level == 0)
+	{
+		return;
+	}
+
+	// Handle multiple ports set to the same interrupt. If any are set, interrupt should be triggered
+	int data = 0;
+
+	if (m_lp_enabled && (m_lp_int_idx == level))
+	{
+		data |= m_lp_intr;
+	}
+	if (m_aux_enabled && (m_aux_int_idx == level))
+	{
+		data |= m_aux_intr;
+	}
+	if (m_modem_enabled && (m_modem_int_idx == level))
+	{
+		data |= m_modem_intr;
+	}
+
+	switch(level)
+	{
+		case 1:
+			set_slot_int3(data);
+			break;
+		case 2:
+			set_slot_int4(data);
+			break;
+		case 3:
+			set_slot_int5(data);
+			break;
+	}
+}
+
+void z_89_11_device::aux_int(int data)
+{
+	if (!m_aux_enabled)
+	{
+		return;
+	}
+
+	m_aux_intr = data;
+
+	update_intr(m_aux_int_idx);
+}
+
+void z_89_11_device::device_start()
+{
+	save_item(NAME(m_lp_enabled));
+	save_item(NAME(m_lp_int_idx));
+	save_item(NAME(m_aux_enabled));
+	save_item(NAME(m_aux_int_idx));
+	save_item(NAME(m_modem_enabled));
+	save_item(NAME(m_modem_int_idx));
+	save_item(NAME(m_lp_intr));
+	save_item(NAME(m_aux_intr));
+	save_item(NAME(m_modem_intr));
+}
+
+void z_89_11_device::device_reset()
+{
+	ioport_value const cfg_lp(m_cfg_lp->read());
+	ioport_value const cfg_aux(m_cfg_aux->read());
+	ioport_value const cfg_modem(m_cfg_modem->read());
+
+	m_lp_enabled    = bool(BIT(cfg_lp, 0));
+	m_aux_enabled   = bool(BIT(cfg_aux, 0));
+	m_modem_enabled = bool(BIT(cfg_modem, 0));
+
+	// LP Interrupt level
+	m_lp_int_idx = BIT(cfg_lp, 1, 2);
+
+	// AUX Interrupt level
+	m_aux_int_idx = BIT(cfg_aux, 1, 2);
+
+	// MODEM Interrupt level
+	m_modem_int_idx = BIT(cfg_modem, 1, 2);
+}
+
+void z_89_11_device::device_add_mconfig(machine_config &config)
+{
+	// Parallel 0xD0-0xD7 (320 - 327 octal)
+	I8255(config, m_lp, m_clock);
+
+	// AUX DCE 0xE0-0xE7 (340 - 347 octal)
+	//
+	INS8250(config, m_aux, XTAL(1'843'200));
+	m_aux->out_tx_callback().set("dce2", FUNC(rs232_port_device::write_txd));
+	m_aux->out_dtr_callback().set("dce2", FUNC(rs232_port_device::write_dtr));
+	m_aux->out_rts_callback().set("dce2", FUNC(rs232_port_device::write_rts));
+	m_aux->out_int_callback().set(FUNC(z_89_11_device::aux_int));
+
+	rs232_port_device &dce2(RS232_PORT(config, "dce2", default_rs232_devices, "loopback"));
+	dce2.rxd_handler().set(m_aux, FUNC(ins8250_device::rx_w));
+	dce2.dcd_handler().set(m_aux, FUNC(ins8250_device::dcd_w));
+	dce2.dsr_handler().set(m_aux, FUNC(ins8250_device::dsr_w));
+	dce2.cts_handler().set(m_aux, FUNC(ins8250_device::cts_w));
+	dce2.ri_handler().set(m_aux, FUNC(ins8250_device::ri_w));
+
+	// Modem DTE 0xD7-0xDF (330 - 337 octal)
+	SCN2661C(config, m_modem, XTAL(5'068'800));
+	m_modem->txd_handler().set("dte", FUNC(rs232_port_device::write_txd));
+	m_modem->dtr_handler().set("dte", FUNC(rs232_port_device::write_dtr));
+	m_modem->rts_handler().set("dte", FUNC(rs232_port_device::write_rts));
+
+
+	rs232_port_device &dte(RS232_PORT(config, "dte", default_rs232_devices, "loopback"));
+	dte.rxd_handler().set(m_modem, FUNC(scn2661c_device::rxd_w));
+	dte.dcd_handler().set(m_modem, FUNC(scn2661c_device::dcd_w));
+	dte.dsr_handler().set(m_modem, FUNC(scn2661c_device::dsr_w));
+	dte.cts_handler().set(m_modem, FUNC(scn2661c_device::cts_w));
+}
+
+
+static INPUT_PORTS_START( z_89_11_device )
+
+	// INS8250
+	PORT_START("CFG_LP")
+	PORT_CONFNAME(0x01, 0x01, "LP - DCE (340 octal) Enabled" )
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x01, DEF_STR( Yes ))
+	PORT_CONFNAME(0x06, 0x00, "LP - DCE (340 octal) Interrupt level")
+	PORT_CONFSETTING(   0x00, DEF_STR( None ))
+	PORT_CONFSETTING(   0x02, "3")
+	PORT_CONFSETTING(   0x04, "4")
+	PORT_CONFSETTING(   0x06, "5")
+
+	// 8255 chip
+	PORT_START("CFG_AUX")
+	PORT_CONFNAME(0x01, 0x01, "AUX - DCE (320 octal) Enabled" )
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x01, DEF_STR( Yes ))
+	PORT_CONFNAME(0x06, 0x00, "AUX - DCE (320 octal) Interrupt level")
+	PORT_CONFSETTING(   0x00, DEF_STR( None ))
+	PORT_CONFSETTING(   0x02, "3")
+	PORT_CONFSETTING(   0x04, "4")
+	PORT_CONFSETTING(   0x06, "5")
+
+	// 2661
+	PORT_START("CFG_MODEM")
+	PORT_CONFNAME(0x01, 0x01, "MODEM - DTE (330 octal) Enabled" )
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x01, DEF_STR( Yes ))
+	PORT_CONFNAME(0x06, 0x00, "MODEM - DTE (330 octal) Interrupt level")
+	PORT_CONFSETTING(   0x00, DEF_STR( None ))
+	PORT_CONFSETTING(   0x02, "3")
+	PORT_CONFSETTING(   0x04, "4")
+	PORT_CONFSETTING(   0x06, "5")
+	PORT_CONFNAME(0x08, 0x00, "Interrupt on Rx Ready Enabled")
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x08, DEF_STR( Yes ))
+	PORT_CONFNAME(0x10, 0x00, "Interrupt on Tx Ready Enabled")
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x10, DEF_STR( Yes ))
+	PORT_CONFNAME(0x20, 0x00, "Interrupt on Tx Empty Enabled")
+	PORT_CONFSETTING(   0x00, DEF_STR( No ))
+	PORT_CONFSETTING(   0x20, DEF_STR( Yes ))
+
+INPUT_PORTS_END
+
+
+ioport_constructor z_89_11_device::device_input_ports() const
+{
+	return INPUT_PORTS_NAME(z_89_11_device);
+}
+
+}
+
+DEFINE_DEVICE_TYPE_PRIVATE(H89BUS_Z_89_11, device_h89bus_right_card_interface, z_89_11_device, "z_89_11", "Heath/Zenith Z-89-11 Multi-Function I/O Card");
diff --git a/src/devices/bus/heathzenith/h89/z_89_11.h b/src/devices/bus/heathzenith/h89/z_89_11.h
new file mode 100644
index 0000000000000..76c6d7b230bff
--- /dev/null
+++ b/src/devices/bus/heathzenith/h89/z_89_11.h
@@ -0,0 +1,19 @@
+// license:BSD-3-Clause
+// copyright-holders:Mark Garlanger
+/***************************************************************************
+
+  Heath/Zenith Z-89-1 Multi-Function I/O card
+
+****************************************************************************/
+
+
+#ifndef MAME_BUS_HEATHZENITH_H89_Z_89_11_H
+#define MAME_BUS_HEATHZENITH_H89_Z_89_11_H
+
+#pragma once
+
+#include "h89bus.h"
+
+DECLARE_DEVICE_TYPE(H89BUS_Z_89_11, device_h89bus_right_card_interface)
+
+#endif // MAME_BUS_HEATHZENITH_H89_Z_89_11_H